Write in the form .

Answer and explanation

Correct answer: D.

  1. Step 1: Half the coefficient of is 3, so : .
  2. Step 2: Compare with : .
Answer
.
Why not the others: : already contains 9, so 7 − 9 = −2. : is half the coefficient of , which is 3. : the constant 7 was copied without subtracting the 9.

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